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aphasemeter outputs the audio received (with metadata injection) on its first output pad, and the generated video on the second, so in your case you were attempting to map the audio output into the video of your output file. The modified command below should work for you, I believe.

aphasemeter outputs the audio received (with metadata injection) on its first output pad, and the generated video on the second, so in your case you were attempting to map the audio output into the video of your output file. The modified command below should work for you, I believe.